title: System of laser pump and synchrotron radiation probe microdiffraction to investigate optical recording process.
abstract: We have developed a system of laser-pump and synchrotron radiation probe microdiffraction to investigate the phase-change process on a nanosecond time scale of Ge2Sb2Te5 film embedded in multi-layer structures, which corresponds to real optical recording media. The measurements were achieved by combining (i) the pump-laser system with a pulse width of 300 ps, (ii) a highly brilliant focused microbeam with wide peak-energy width (ΔE∕E ~ 2%) made by focusing helical undulator radiation without monochromatization, and (iii) a precise sample rotation stage to make repetitive measurements. We successfully detected a very weak time-resolved diffraction signal by using this system from 100-nm-thick Ge2Sb2Te5 phase-change layers. This enabled us to find the dependence of the crystal-amorphous phase change process of the Ge2Sb2Te5 layers on laser power.
authors.affiliation: Research and Utilization Division, Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-gun, Hyogo 679-5198, Japan.
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Yasuda
authors.forename: Yoshimitsu
authors.initials: Y
authors.lastname: Fukuyama
authors.forename: Shigeru
authors.initials: S
authors.lastname: Kimura
authors.forename: Kiminori
authors.initials: K
authors.lastname: Ito
authors.forename: Yoshihito
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Osawa
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Matsunaga
authors.forename: Rie
authors.initials: R
authors.lastname: Kojima
authors.forename: Kazuya
authors.initials: K
authors.lastname: Hisada
authors.forename: Akio
authors.initials: A
authors.lastname: Tsuchino
authors.forename: Masahiro
authors.initials: M
authors.lastname: Birukawa
authors.forename: Noboru
authors.initials: N
authors.lastname: Yamada
authors.forename: Koji
authors.initials: K
authors.lastname: Sekiguchi
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Fujiie
authors.forename: Osamu
authors.initials: O
authors.lastname: Kawakubo
authors.forename: Masaki
authors.initials: M
authors.lastname: Takata